FR2563517A1 - METHOD FOR INTRODUCING A LOAD IN A PROJECTILE ENVELOPE - Google Patents

Abstract

METHOD OF INTRODUCING A CHARGE IN A PROJECTILE SOCKET. FIRST PRECOMPRESS AN EXPLOSIVE CHARGE OUTSIDE AN ENVELOPE, THEN WE INSERT IT IN THE FORM OF A BLANK 5 IN ENVELOPE 6 AND THEN COMPLETE THE COMPRESSION WITH A PUNCH 9. TO OBTAIN A UNIFORM COMPACTION OF THE LOAD IN THE ENVELOPE 6, THE LOAD IS BROUGHT TO A TEMPERATURE LOWER THAN THAT OF THE ENVELOPE 6, AFTER PRECOMPRESSION. BEFORE THE NEUTRALIZATION OF THIS TEMPERATURE DIFFERENCE, THE CHARGE IS INTRODUCED IN ENVELOPE 6. PREFERABLY, COMPRESSION IS COMPLETED AND FIXED IN IT BEFORE THE NEUTRALIZATION OF THE TEMPERATURE DIFFERENCE.

Description

Method of introducing a charge into a

projectile envelope.

  The present invention relates to a method of

  troduction of a charge into a projectile envelope, first precompressing the charge on the outside of the envelope, then introducing it into the socket and then completing the compression.

  A process of this type is described in DE-A-

31 07 788.

  When one compresses active loads of den-

  high level, it is necessary to apply compro-

  correspondingly high to the load. It has been found

  when compressing elongated loads, the compaction

  the area of the load opposite the punch is lower than in the area near it. This must be attributed to the internal friction forces of

  the material of the explosive charge. Such heterogeneous

  burden compaction have untoward effects

  on the performance of the explosive charge.

  The present invention relates to a method of the aforementioned type for obtaining a compacted charge

  (compressed) evenly in the shell of the projectile.

  To achieve this objective, according to the invention,

  from a process of the type mentioned above, after the precom-

  pressure of the charge, it is brought to a temperature lower than that of the shell of the projectile and one

  introduces the charge into the envelope before neutralizing

  the difference in temperature. Thanks to the difference

  temperature difference between the envelope and the load, the volume of the precompressed load is less than

  volume of the shell of the projectile intended to house it.

  When neutralizing the temperature difference

  which takes place after the introduction of the charge into the

  veloppe, compaction of the load in the envelope occurs automatically. Thus, the charge is compacted, even in areas that would not be compacted from the

same way by compression.

  Because the envelope and the precompensated

  are brought to different temperatures before

  to be united, the dilatation and the contraction

  latives facilitate, in addition, the introduction of the load in the envelope.

  According to a preferred embodiment of the invention,

  tion, the compression of the load is already completed after

  its introduction into the envelope, before the neutralization

  difference in temperature. Preferably, the charge is then fixed in the envelope prior to the neutralization of the temperature difference. grace

  to this extent, when neutralizing the difference between

  temperature, the load is already mechanically

  only in the envelope, so that the forces of expansion and contraction

  complete on compacting the load.

  According to a preferred embodiment of the invention,

  In this case, the jacket is left at room temperature and the charge is cooled with respect thereto. As a result, the load is not heated by

a preheated envelope.

  We will now describe preferred forms

  of an example of the process according to the invention,

  1 to 5 show successive operating steps of the process according to the invention, or more precisely: FIG. 1 represents the precompression of the charge; Figure 2 shows the cooling of the load; Figure 3 shows the introduction of the charge into a projectile envelope;

  Figure 4 shows the completion of the compaction

  the load in the envelope; Figure 5 shows the attachment of the load in the envelope; An explosive charge material 1 is loaded into a compression molding tool sleeve 3 placed on a lower punch 2. An upper punch 4 is then pressed against the lower punch 2. This produces a blank 5 whose volume can be adjusted. still be slightly greater than the interior volume of a projectile envelope 6 having a lining 7

(see Figure 5).

  The heterogeneities of compaction of the explosive charge material 1 do not have any troublesome effects in

the draft 5.

  The blank 5 is cooled in a chamber of

  cooling 8 at about -30 C (see Figure 2).

  It contracts then. Then we introduce the draft

  contract 5 in the envelope 6 and the packing is

  Figure 7 on the blank 5 (see Figure 3). The envelope 6

  and the liner 7 are at room temperature.

  Immediately after, the lining 7 is pressed on the still-cooled blank 5 by means of another punch 9, this completing the compaction of the blank

(see Figure 4).

  Then, in a tapping 10 of the casing 6, a fixing ring 11 having a thread 12 is screwed. The fixing ring 11 presses the lining 7 onto the still-cooled blank 5 (FIG. 5). it

  maintains the blank 5 between the envelope 6 and the cover

7.

  Immediately thereafter, the temperature of the blank formed by the explosive charge material i rises to the value of the ambient temperature of the casing 6 and the packing 7. The resulting expansion results in compaction of the explosive charge material. 1 of the blank 5, simultaneous with the compaction produced

  by the completion of compression and adding to it.

  The end result is therefore that all areas of the

  explosive charge material 1 are compacted uniformly

  ance. The choice of expansion and contraction depending on the difference in temperature and the clearance between the envelope 6 and the precompressed preform 5 allows

  to determine the degree of additional compaction.

  The invention is not limited to the embodiment described. It can also be implemented

  preheating the envelope 6 more or exclusively.

  It is also possible to use the invention when introducing, instead of the precompressed feed in a single block

  described, two or more fractions of charge pre-

compressed in the envelope 6.

Claims (5)

  1. Method of introducing a charge into a projectile envelope, first precompressing the   load outside the envelope, then insert it   in the casing and completing the compression, characterized in that after precompression of the charge, it is brought to a lower temperature than the casing, and in that the charge is introduced.   in the envelope before the neutralization of this dif- temperature difference.   2. Method according to claim 1, characterized in that the compression of the charge is completed after introduction into the envelope, before neutralization. the difference in temperature.   3. Method according to claim 2, characterized in that the load is fixed after introduction into the envelope, before the neutralization of the difference temperature.   4. Process according to any one of the claims   tions, characterized in that the   veloppe at room temperature and cool the load relative to it.   5. Process according to any one of the claims   previous arrangements, characterized in that the charge at about -30 C.